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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id u19sm3124045pgo.73.2021.10.13.00.02.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Oct 2021 00:02:42 -0700 (PDT) Date: Wed, 13 Oct 2021 00:02:41 -0700 From: Kees Cook To: Christophe Leroy Cc: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Andrew Morton , "James E.J. Bottomley" , Helge Deller , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v1 07/10] lkdtm: Force do_nothing() out of line Message-ID: <202110130002.0FC7878252@keescook> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b="Yu/d1w7s"; spf=pass (imf23.hostedemail.com: domain of keescook@chromium.org designates 209.85.216.46 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: CBC6590000A6 X-Stat-Signature: 59gcfoj4cca17mjnbhbxtp4m5e63p9jj X-HE-Tag: 1634108562-87681 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000010, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 11, 2021 at 05:25:34PM +0200, Christophe Leroy wrote: > LKDTM tests display that the run do_nothing() at a given > address, but in reality do_nothing() is inlined into the > caller. > > Force it out of line so that it really runs text at the > displayed address. > > Signed-off-by: Christophe Leroy Acked-by: Kees Cook -- Kees Cook